Large-scale power storage equipment for leveling the unstable output of renewable energy has been expected to spread in order to reduce CO_2 emissions. The compressed air energy storage system described in this paper is suitable for storing large amounts of energy for extended periods of time. Particularly, in North America, China and other areas, where rock salt layers are widely distributed, using underground spaces formed in the rock salt layers to store compressed air can reduce the unit kWh cost of equipment. The equipment's responsiveness was obtained on the basis of the data for large-scale demonstration equipment of 1 MW class, verifying that the equipment can respond to commands within seconds. This paper further describes the future development of the compressed air energy storage system.
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